Magic slate



Dec. 22, 1953 H. S. CHASE MAGIC SLATE Filed April 29, 1952 INVENTOR.HERBERT SCHHSE H TTORNEY Patented Dec. 22, 1953 UNITEDMSTATES"PATENTOFFICE Claims.

monly called a magic slate, and more particularly to the type comprisinga plurality of sheet members, two of which need be separated to effecterasure. I.

Slates of this kind haveheretoforebeen-made by having its-sheets joined=along one endin pad form. Such sheet'members usually include one ofcardboard facedwith a soft colored wax, another is an impressionablesheetof thin transparent plastic material on whi'ch a'stylusis used, andthere also may be an intermediate translucent paper sheet. To erase,regardless of slate structure, -the wax-carrying sheet has to beseparated ,fromthesheet-adjacent. -In the pad formfto erase, one-of :thesheets of those to be; separated, is liftedfrom the other to the lineofjunctureof the-sheets. All sheet surfaces being thus exposed, any thinpaper sheet included is subject to become creased. This isobjectionable, because the clarity of theslate becomes marred. Attempts:have been made to join the sheets at all corner regions and providing astrip, slidably mounted'between the sheets needing separationinorderfltoerase. This added greatly to'the' cost ofnianufacture. ,Al'so, dust anddirt could still ccmeanddoes come .between the sheets. Working the slidewould spread the dirt andthe slate would acquire blurred streaks. Thiscondition was not remedied in still another attempt, where one of thesheet members was made slidable'outwardly' of the slate assembly, tocause erasure.

One of the objects of this invention is to provide a novel and improvedmagic slate construction of the type mentioned, which avoids the statedobjectionable experiences, by affording entrance between the sheets tobe separated, but at a single point where there is a comparatively smallhole for admission of the stylus. Then, a manual movement of but slightextent is all that is necessary to accomplish erasure.

Another object hereof is to provide a novel and improved magic slate ofthe character described, which is neat in appearance and is adaptable tobe incorporated as a component which may even be one of the exteriorwalls of a wallet, handbag or the like, as a matter of example.

A further object of this invention is to provide a magic slate of thetype set forth, of novel and improved construction, which besides havingthe advantageous features mentioned, is relatively cheap to manufacture,easy to manipulate with assurance that for erasure, the

a e f 1 Q Herbert s Chase, Flushing, N. Y. Application April 29, 1952,Serial No. 285,011

2 I stylus will come only between the sheets to be separated, and whichis efficient in carrying out the purposes for which it is designed.

Other objects and advantages will become apparent as this disclosureproceeds.

In the accompanying drawings forming part of this specification,similarcharacters of reference indicate corresponding parts in all the views.

Fig. 1 is a perspective view of a magic slate embodying the teachings ofthis invention.

Fig. 2 is a magnified broken section taken at lines 22 inFig. 'l.

Fig. 3 isa perspective view of a wallet, one outer wall of whichcomprises a magic slate structure in accordance with my presentinvention.

Fig. 4 is an enlarged fragmentary section taken at lines 4-4 in Fig. 3.

In the drawings, the numeral l5 denotes generally a magic slate of thetype'made up of sheets in superposed relation; Regardless of the numberof' the sheets, their physical nature as to material, coating or'finish,the practice of this invention only requires a type of magic slate madeup of sheets, two of which need be separated to accomplish erasure." Toillustrate this invention, I have shown slate [5 of the type made up ofthree sheet members. The backing sheet I 6 is of cardboard and its faceadjacent the middle sheet '11, carries a layer of soft, col-, ored waxmaterial. Sheet I1 is a-translucent tissue paper, and the upper sheet I8is a thin sheet of transparent Celluloid or other suitable plastic. Whena stylus I9 is written with some pressure on the sheet l8, the middlesheet i! will be caused to adhere to the wax coating on the backingsheet I 6, along the lines of the writing, and such lines of contactwill appear as writing through the top sheet [8. To erase," it isnecessary to separate sheets I5 and I1. All this is well known in theart.

In the practice of this invention, no ingress between the sheets isprovided except through the small hole or opening 20 through which thestylus I9 may enter. This hole is preferably adjacent one of the edgesof the assembly. Using the support offered the stylus at the hole, as apivot point, the small exterior end portion of the inserted stylus, needbe given but a slight swing by hand, to separate the sheets to efiecterasure.

So, the marginal edges of all the sheets comprising the magic slate l5,are joined in any suitable manner as for instance by perimetralstitching 2|, or by being pasted together; the pasted perimetral lanebeing shown as A in Fig. 2. In order that the stylus I9 upon insertioninto the hole 20, shall come between the sheets H5 and I! which need beseparated for erasure and not between the sheets I1 and IS, the latterpair of sheets are secured together around such hole 20 as indicated atA. The hole 2% is of course through both sheets l8 and H.

A magicslate so made and manipulated for effecting erasure, can be madeone of the outer walls of for instance a wallet as shown in Fig. 3. Theplies 22, 23 ordinarily constitutingthe wall structure of the wallet 24,is fashioned to hold the sheets [6, ll, 18 comprising a magic slate, asin a frame; the ply 22, haying a window 22. The sheets mentioned may beloose from each other because their perimetral edges. are encompassed insaid frame formed by the wa l p i 23 an l e essb tween t e sheets is o yor d, hrough he ho e 0 T a sure that the stylus l9 enter only betweenthe sheets l6 and I'l this pair ofsheets are. secured together aroundthe hole 20 This inventionis capable Q5 numerous" forms and variousapplicationsrwithout departing; from the essential features hereindisclosed, It is therefore intended and desired that the enibodi-v mentsshown herein shall. be deemed: illustrative and not restrictive and thatthe patent shall cover all patentabler novelty. herein set forth;reference being had to the followingclaims rather than tothe specificdescription herein: to indicate the scopaof this invention.

I claim:

1. In a magic slate device, a plurality, 01;" sheets in. superposed;relatio n two adjacent. ones of which need be separated. to; effecterasurefl a y s for e-ins l rress ons he u pe mo he t. me ns ho i g saheet to ether subst ia al ro nd th he et al: ed es. whereby e sty ucannot be: nter d: be ween any. f t e s e t a d'noneofthe'sh eefi leisable in its plane relative to the other; 3; y one of e. she ts: to b seete and. all. sheets lyi to one side.- of; said e sheet-.. be n pro d w ta ho e resnectively; ll; or s id holes-being in alignmentior; he tylus.th r throueh; s h es: bein nward the. p r al p tions of said. sheets.whereaid means holds all of said sheets. to ether; at east one of saidholes being comparatively very small in relation to the dimensions ofthe sheets, whereby when the stylus is partially inserted through allsaid holes and positioned to lie between said two sheets to beseparated, said two sheets become separated upon manually swinging thestylus; the support offered the stylus by the edge of said comparativelysmall hole, serving as th u c um p t for uch. swi ing movement.

2; The device as defined in claim 1, wherein the mentioned means holdsall the sheets joined around their perimeter and wherein the holes arein the uppermost sheet and in all sheets respectively successivelyadjacent to said uppermost? sheet including the one of the two sheets tobe, separated. which is nearest the uppermost sheet.

3. The device as defined in claim 2, wherein all the sheets having theholes are joined around said. holes wherebythe styles can. be insertednly. between. the. two. sh ets to: be separat d.

41... The dericees defined incla m 1, wh r in he mentioned means. i a.ire-me; h ldin ai sheets whereby the uppermost sheet is exposed; saidframe havin a: portion: oil-erlapping. the mar in edges; or: the;uppermost; sheet and wherein. the holes; are throu h. said; overlapp gportion of the vvframe. the; uppermost: sheet. and. all sheetsrespectively successiyelvad-iacent to said u ermost" sheet including:the one. or; the; two sheets to: be separated; which. is; nearest theuppermost sheet.

5.. Thedevice as: defined in claim 4; wherein all components. having;the.- holes, are. joined around said; holes; whereby the stylus can.beentered only between the two. sheets to be separated.

HERBERT s. CHASE.

References Cited. the filef-: this pa en UNITED STATESi PATENTS

